We encourage them to get a graphing calculator, and many do so. Teachers have a class set of 10-15, which is usually enough. They are required to have a scientific calculator and bring it to class, and then they can borrow a TI-83+ from the teacher if
it's needed. If they are going to be unable to get a scientific, we assign them one.

I don't think public schools can require purchase of a graphing calculator.

For the last several years, we have assigned calculators to our Alg 2/Trig classes like a textbook. They are responsible for it for the year, and turn it in at the end of their regents exam. If they lose
it, they have to pay for it. We are considering trying this with all of our classes next year, i.e. adding alg and geometry to the loaning process. Do any other schools do this? Has it been successful? We are worried that the younger students won’t be
as responsible, and lose them. Please let us know if you have tried this and how it worked out for you! Or, do you require your students to buy their own graphing calculator in their freshman year?